665655265003542 has 32 divisors (see below), whose sum is σ = 1452688468951680. Its totient is φ = 201665145981120.

The previous prime is 665655265003517. The next prime is 665655265003571. The reversal of 665655265003542 is 245300562556566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213990992 + ... + 1214539187.

It is an arithmetic number, because the mean of its divisors is an integer number (45396514654740).

Almost surely, 2^{665655265003542} is an apocalyptic number.

665655265003542 is an abundant number, since it is smaller than the sum of its proper divisors (787033203948138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665655265003542 is a wasteful number, since it uses less digits than its factorization.

665655265003542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428534348.

The product of its (nonzero) digits is 194400000, while the sum is 60.

The spelling of 665655265003542 in words is "six hundred sixty-five trillion, six hundred fifty-five billion, two hundred sixty-five million, three thousand, five hundred forty-two".